EVAP wiring help | Ford Escort Owners Association (FEOA)

EVAP wiring help

Discussion in 'Electrical' started by 99SseSPORT, May 18, 2019.

  1. 99SseSPORT

    99SseSPORT FEOA Member

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    I could use some EVAP wiring assistance. It's for the vent solenoid in the rear bumper of a 2001 ZX2 swapped 1997 Wagon. So a 2001 ZX2...


    I double and triple checked wiring diagrams. It's only 2 wires. A BLUE/PINK STRIPE and WHITE/BLUE STRIPE. I can't seem to get them correct.


    1st: I ran the Blue/Pk to pin 67 and White/Bl to 12v. I got code P0453. I swapped the wires. Same code.


    2nd: I used another person's wiring diagram they sent me for it. I changed the Blue/Pk to pin 56 and White/Bl to pin 71. I got code P0453 and now P1451. I swapped wires and still same 2 codes.


    The zx2 powertrain swap runs and drives great. I just want it to pass smog so I can daily drive it now. Please help if you can. Thank you very much!
  2. Swift

    Swift FEOA Donator

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    I only have a little knowledge in this case and what I am saying is relative to sohc.

    But I believe the way you had it first was more likely correct. One of the wires goes to pin 67 on sohc, but the other wire goes to the white with red stripe power wire. This white/red power is power from the ECU, I don't know if it is actually 12v though.
    The white with red stripe I believe provides power to the maf as well as some other sensors.
    So if you had it powered to a full 12v it could have been alot more power than the ecu was expecting to receive back.

    Sorry I don't know a lot more about 3rd gens or zx2s.
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  3. 99SseSPORT

    99SseSPORT FEOA Member

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    I just tried that. Blue/pink to pin 61 and white/blue to the red/white pin 71. Still a p0453 :-(
  4. Swift

    Swift FEOA Donator

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    Are you sure it is 61?I just got out the '97 evtm and it says pin 67.

    Probably a mistype with 60s and 70s.
    Last edited: May 18, 2019
  5. Swift

    Swift FEOA Donator

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    Out of curiosity is the evap sensor in the back with the evap valve? I am just curious how the later ones were set up.
  6. 99SseSPORT

    99SseSPORT FEOA Member

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    I'm not positive I don't have the zx2 wiring diagram anymore. I can't find it on google either.

    Evap sensor I think is also a valve that routes the charcoal canister line to the intake manifold. It is up under the hood above the intake manifold on the firewall.

    The canister itself is in the rear drivers side bumper and a solenoid is attached to the canister. I believe this solenoid's wiring is my problem.
    Last edited: May 18, 2019
  7. Swift

    Swift FEOA Donator

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    I guess the correct term is purge flow sensor. On my 96 the valve and sensor are separated by about 2 inches of vacuum line under the hood.

    You are running the zx2 ecu right? If so the pinout could be somewhat different, but I guess if it is was different you wouldn't get the evap code.

    You may need a zx2 expert as I don't see what could be off as your wiring to the valve seems right.
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  8. 99SseSPORT

    99SseSPORT FEOA Member

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    Yea all zx2 in the wagon, even the fuel tank, lines, and filler neck...all except the wiring past the cup holders. I wired in the fuel pump, fuel pump driver, and fuel tank pressure sensor along with the 2 Evap wires that lead to the rear bumper. I've asked around with a few zx2 guys. I hope I get an answer soon I want to drive it!
  9. rbailin

    rbailin FEOA Member

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    As I just posted in another thread, the 97 Evap system (purge valve and flow sensor), along with the evap canister, is located in front of the battery tray. On 98 and later, they moved the stuff to the passenger side firewall, and moved the canister to the back of the car, to the left of the gas tank.

    A failed sensor or valve is usually P145x. (An actual leak is P0455.) P0453 is high input on the sensor. Your system is wired correctly for the vent solenoid (with WH/BU going to +12V off the Fuel Inj fuse and BU/PK going to pin 67 on the ZX2 ECU).

    The only evap-related sensor I can see on the ZX2 ECU is pin 62 for the Fuel Tank Pressure Sensor on pin 62. The FTP sensor connector has 3 wires: BK/WH to pin 62, LG/BK to ground, and LG/WH to +5V from pin 90. (If you routed LG/WH directly from +12V, that may be your problem.)

    (Ref: 2000 Escort Wiring Diagrams, p. 24-7, 24-6.)
    Last edited: May 20, 2019
  10. 99SseSPORT

    99SseSPORT FEOA Member

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    I have my FTPS wired like this:

    Black/white to pin 62 (input)
    Green black to pin 91
    Green white to pin 90

    I have not changed those since installing.
  11. 99SseSPORT

    99SseSPORT FEOA Member

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  12. 99SseSPORT

    99SseSPORT FEOA Member

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    It looks like my FTP sensor is seeing 12v and not 10.5v. I did a harness pin out with a volt meter and something is bleeding voltage

    Attached Files:

  13. rbailin

    rbailin FEOA Member

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    pin 91 LG/BK is a common signal return/ground for many sensors.

    Probably a typo, but the pin 90 reference voltage at the FTP LG/WH is 5V, not 10.5V.
    It also supplies voltage to the Power Steering Pressure Sensor, the Injection Pressure Sensor, and the Throttle Position Sensor,
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  14. 99SseSPORT

    99SseSPORT FEOA Member

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    I fixed everything. It all works.

    I had to remove the zx2 wire from pin 62 from its harness. I used my wire. The excess voltage was bleeding in from the zx2 harness somewhere.

    I cut it out and the voltage dropped. I followed a procedure for specing out the wires from Brad Eff on Facebook.

    My gas gauge was also not working. I simply bypassed the gauge when running my wires out of the back to the PCM. For this fix, I cut my wire out and attached the brown/yellow wire to the factory escort body wire for the gauge from the sending unit.

    I have no check engine lights and just passed California smog.
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  15. Swift

    Swift FEOA Donator

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    Rock on!

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